Coal ash decarbonizing system

Abstract

The utility model relates to the technical field of coal ash treatment, in particular to a coal ash decarbonizing system. The coal ash decarbonizing system comprises a coal mill, a coal-fired boiler and a powder supplying and conveying assembly, the coal mill comprises a separator, a discharging opening is formed in the top of the separator, and a feeding opening of the coal-fired boiler is communicated with the discharging opening of the coal mill through a conveying pipeline; the separator is internally provided with an air duct for screening pulverized coal, and the air duct is communicated with the discharge port; the separator is provided with at least one interface, and the interface is communicated with the air duct; one end of the powder supplying and conveying assembly communicates with the connector. The carbon residue content and the combustible organic matter content in the fly ash are greatly reduced through combustion, the fly ash meets the building raw material performance requirement and the fly ash resource recycling requirement, the resource utilization rate is increased, and the purposes of reducing cost, improving efficiency, saving energy and reducing emission are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fly ash processing, in particular to a fly ash carbon removal system. Background Art

[0002] Complete combustion of coal is not yet possible due to technical issues, so the fly ash and slag produced by coal gasification from coal-fired power plants contain different amounts of unburned carbon and combustible organic matter. When the content of unburned carbon in fly ash is too high, it will affect its development and utilization in various fields. The state strictly prohibits the use of fly ash and gasification slag with excessive carbon content.

[0003] The pulverized coal produced by the pulverizer is screened by a separator and then transported to a coal-fired boiler through a pipeline for combustion. After the pulverized coal is burned, fly ash is produced. However, the fly ash after the first combustion in the coal-fired boiler still contains excessive unburned carbon. This fly ash does not meet the performance requirements of building raw materials and cannot be used. Utility Model Content

[0004] (I) The problem to be solved by the utility model is that the fly ash after primary combustion in a coal-fired boiler still contains excessive unburned carbon. This fly ash does not meet the performance requirements of building raw materials and cannot be used.

[0005] (II) Technical solution

[0006] A fly ash decarbonization system comprises a coal pulverizer, a coal-fired boiler and a fly ash supply and conveying assembly, wherein the coal pulverizer comprises a separator, a discharge port is arranged on the top of the separator, and a feed port of the coal-fired boiler and a discharge port of the coal pulverizer are connected via a conveying pipeline;

[0007] The separator has an air duct for screening coal powder inside, and the air duct is connected to the discharge port;

[0008] The separator is provided with at least one interface, and the interface is connected to the air duct;

[0009] One end of the powder replenishing conveying assembly is connected to the interface, and the powder replenishing conveying assembly is used to blow fly ash into the air duct.

[0010] According to one embodiment of the utility model, the powder replenishment and conveying assembly includes a material replenishment mechanism, a material feeding mechanism, a mixing chamber, an air supply mechanism and a powder conveying pipeline;

[0011] The mixing chamber has a mixing cavity inside, a powder inlet is provided on the top of the mixing chamber, an air inlet and an air outlet are provided on the mixing chamber, and the powder inlet, the air inlet and the air outlet are all connected to the mixing cavity;

[0012] The feeding mechanism is connected to the powder inlet and is used to feed fly ash into the mixing chamber;

[0013] One end of the air supply mechanism is connected to the air inlet and is used to supply air into the mixing chamber;

[0014] One end of the powder conveying pipeline is connected to the air outlet, and the other end thereof is connected to the interface.

[0015] According to one embodiment of the utility model, the feeding mechanism includes a powder conveying bin and a discharger for storing fly ash, the discharge port of the powder conveying bin is provided with a discharge pipe, the discharge pipe is provided with a valve for controlling the on-off thereof, one end of the discharger is connected to the discharge pipe, and the other end thereof is connected to the powder inlet of the mixing chamber.

[0016] According to one embodiment of the utility model, the air supply mechanism includes a fan and a filter, the air inlet of the fan and the air outlet of the filter are connected through a pipeline, and the air outlet of the fan is connected to the air inlet of the mixing chamber.

[0017] According to an embodiment of the utility model, the air supply mechanism further includes a muffler, and two mufflers are provided, namely a first muffler and a second muffler, and two filters are provided, namely a first filter and a second filter;

[0018] The air inlet of the first muffler and the first filter are connected through a pipeline, and the air outlet of the first filter is connected to the air inlet of the fan;

[0019] The air inlet of the second filter is connected to the air outlet of the fan through a pipe, the air outlet of the second filter is connected to the first end of the second muffler, and the second end of the second muffler is connected to the air inlet of the mixing chamber through an air supply pipeline.

[0020] According to an embodiment of the utility model, the air supply pipeline is connected to an air pressure pipe, and a stop valve and a pressure measuring device are installed on the air pressure pipe.

[0021] According to one embodiment of the utility model, the powder conveying pipeline includes a powder conveying pipe and a reducer, the first end of the reducer is connected to the interface, the second end is connected to one end of the powder conveying pipe, one end of the powder conveying pipe is connected to the air outlet of the mixing chamber, and the diameter of the reducer becomes smaller from the first end to the second end of the reducer.

[0022] According to one embodiment of the utility model, the separator is provided with two interfaces, the two interfaces are symmetrically arranged about the axis of the separator, the two interfaces are connected through a bend pipe, a feed hole is opened on the bend pipe, and one end of the powder conveying pipeline is connected to the feed hole.

[0023] According to an embodiment of the utility model, one end of the reducer close to the interface is higher than the other end thereof.

[0024] According to an embodiment of the utility model, the air duct includes an inner air duct and an outer air duct which are connected to each other, the discharge port of the separator is connected to the inner air duct, and the interface is connected to the outer air duct.

[0025] Beneficial effects of the utility model:

[0026] The utility model provides a fly ash carbon removal system, comprising a coal mill, a coal-fired boiler and a powder supply and conveying assembly, the coal mill comprising a separator, a discharge port is arranged on the top of the separator, the feed port of the coal-fired boiler and the discharge port of the coal mill are connected via a conveying pipeline; an air duct for screening coal powder is arranged inside the separator, and the air duct is connected to the discharge port; at least one interface is arranged on the separator, and the interface is connected to the air duct; one end of the powder supply and conveying assembly is connected to the interface, and the powder supply and conveying assembly is used to blow fly ash into the air duct.

[0027] The fly ash burned in the coal-fired boiler is collected and put into the powder feeding conveying assembly, and then the fly ash is blown into the air duct of the separator through the powder feeding conveying assembly. At the same time, the coal mill produces coal powder along the coal grinding block. After the hot air provided by the primary fan in the coal mill enters the wind chamber, it is ejected from the nozzle ring around the grinding disc to blow up the crushed fine coal powder, take away the fine coal powder and dry and heat the coal powder at the same time. The blown coal powder enters the separator upward and mixes with the blown fly ash. The mixed coal powder and fly ash are guided by the coal powder separation baffle in the separator to rotate and flow. During the rotation, they are affected by centrifugal force. The fine coal powder and fly ash are less affected by the centrifugal force and can be conveyed out from the discharge port at the top of the separator with the hot air. The coarse coal powder has a large centrifugal force and will collide with the outer wall of the inner vertebral body and fall back to the grinding disc for re-grinding. Finally, the fine coal powder and fly ash are conveyed to the coal-fired boiler through the conveying pipeline for combustion.

[0028] In this way, the fly ash produced by burning pulverized coal in the coal-fired boiler is transported to the separator through the powder feeding conveying component, the fly ash and the pulverized coal in the grinding disc are mixed and fed into the coal-fired boiler for re-combustion. The residual carbon content and combustible organic matter content in the fly ash are greatly reduced through combustion. The fly ash meets the performance requirements of building raw materials and the requirements for the recycling of fly ash resources, improves resource utilization, and achieves the purpose of reducing costs, increasing efficiency, saving energy and reducing emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A structural diagram provided for an embodiment of the utility model;

[0031] Figure 2 A structural diagram of a separator provided in an embodiment of the utility model;

[0032] Figure 3 A top view of another separator provided in an embodiment of the utility model.

[0033] Icons: 1. Air supply mechanism; 101. Muffler; 102. Filter; 103. Fan; 104. Check valve; 2. Air supply pipeline; 201. Air pressure pipe; 202. Stop valve; 203. Pressure measuring device; 3. Discharger; 4. Valve; 5. Powder conveying bin; 6. Powder conveying pipeline; 601. Reducer; 602. Door body; 603. Elbow; 7. Interface; 8. Separator; 801. Coal powder separation baffle; 9. Coal mill; 901. Center tube; 902. Discharge port. DETAILED DESCRIPTION

[0034] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] like Figure 1-Figure 3 As shown, an embodiment of the utility model provides a fly ash carbon removal system, including a coal mill 9, a coal-fired boiler and a powder supply conveying assembly, the coal mill 9 includes a separator 8, a discharge port 902 is provided on the top of the separator 8, the feed port of the coal-fired boiler and the discharge port 902 of the coal mill 9 are connected through a conveying pipeline; the separator 8 has an air duct for screening coal powder inside, and the air duct is connected to the discharge port 902; at least one interface 7 is provided on the separator 8, and the interface 7 is connected to the air duct; one end of the powder supply conveying assembly is connected to the interface 7, and the powder supply conveying assembly is used to blow fly ash into the air duct.

[0036] It should be noted that if Figure 2As shown, the separator 8 is divided into an outer duct and an inner duct by a conical baffle, wherein the discharge port 902 of the separator 8 is connected to the inner duct, and the interface 7 is connected to the outer duct. A coal powder separation baffle 801 is provided at the junction of the inner duct and the outer duct, and the fly ash blown in from the interface 7 enters the outer duct and mixes with the coal powder in the outer duct, and then the coal powder and the fly ash enter the inner duct together, and finally enter the conveying pipeline from the discharge port 902 at the top of the inner duct, and are conveyed to the coal-fired boiler through the conveying pipeline for combustion.

[0037] In this embodiment, the fly ash burned by the coal-fired boiler is collected and then put into the powder feeding conveying assembly, and then the fly ash is blown into the air duct of the separator 8 through the powder feeding conveying assembly. At the same time, the coal mill 9 produces coal powder along the coal grinding block. After the hot air provided by the primary fan in the coal mill 9 enters the wind chamber, it is ejected from the nozzle ring around the grinding disc to blow up the crushed fine coal powder, take away the fine coal powder and dry and heat the coal powder at the same time. The blown coal powder enters upward into the separator 8 and mixes with the blown fly ash. The mixed coal powder and fly ash are guided by the coal powder separation baffle 801 in the separator 8 to rotate and flow. During the rotation, they are affected by centrifugal force. The fine coal powder and fly ash are less affected by the centrifugal force and can be conveyed out from the discharge port 902 at the top of the separator 8 with the hot air. The coarse coal powder has a large centrifugal force and will collide with the outer wall of the inner vertebral body and fall back to the grinding disc for re-grinding. Finally, the fine coal powder and fly ash are conveyed to the coal-fired boiler through the conveying pipeline for combustion.

[0038] In this way, the fly ash produced by burning coal powder in the coal-fired boiler is transported to the separator 8 through the powder feeding conveying component, the fly ash and the coal powder in the grinding disc are mixed and fed into the coal-fired boiler for combustion again, and the residual carbon content and combustible organic matter content in the fly ash are greatly reduced through combustion. The fly ash meets the performance requirements of building raw materials and the requirements for the recycling of fly ash resources, improves the resource utilization rate, and achieves the purpose of reducing costs, increasing efficiency, saving energy and reducing emissions.

[0039] It should be noted that the coal mill 9 is an existing device. When the coal mill 9 is working, the coal blocks fall from the central cylinder 901 of the coal mill 9 to the rotating grinding disc. Under the action of centrifugal force, the coal diffuses and flows outward, and the coal is crushed by the grinding pressure between the grinding roller and the grinding disc. At the same time, the hydraulic pressure is adjusted according to the amount of coal to generate a greater grinding pressure to grind the coal more finely. After the hot air provided by the primary fan enters the wind chamber, it is ejected from the nozzle ring around the grinding disc to blow up the crushed fine coal powder, take away the fine coal powder, and dry and heat the coal powder. At the same time, objects that cannot be ground, such as coal gangue or large pieces of debris, cannot be blown away by the primary wind due to their heavy weight. They will be blown into the wind chamber of the casing through the nozzle of the nozzle ring, and then scraped into the slag box by the scraper mechanism for discharge. The blown coal powder enters the separator 8 upward, and uses the cyclone principle to screen. The coal powder is guided by the deflection plate to rotate and flow. During the rotation, it is affected by centrifugal force. The fine coal powder is less affected by the centrifugal force and can be transported out with the hot air. The coarse coal powder has a large centrifugal force and will collide with the outer wall of the inner vertebral body and fall back to the grinding disc for re-grinding.

[0040] As a preferred embodiment, Figure 1 As shown, the powder feeding and conveying assembly includes a feeding mechanism, a feeding mechanism, a mixing chamber, an air supply mechanism 1 and a powder conveying pipeline 6. The mixing chamber is cylindrical, and its interior

[0041] The mixing chamber has a powder inlet at the top, and an air inlet and an air outlet are symmetrically provided on the side wall of the mixing chamber near the bottom, and the powder inlet, the air inlet and the air outlet are all connected to the mixing chamber. The feeding mechanism is connected to the powder inlet of the mixing chamber and is used to feed fly ash into the mixing chamber. One end of the air supply mechanism 1 is connected to the air inlet of the mixing chamber and is used to supply air into the mixing chamber. One end of the powder conveying pipeline 6 is connected to the air outlet of the mixing chamber, and the other end thereof is connected to the interface 7 on the separator 8.

[0042] Fly ash is added into the mixing chamber through the feeding mechanism, and the fly ash falls into the mixing cavity of the mixing chamber. The air supply mechanism 1 blows hot air into the mixing cavity. Under the action of the hot air, the fly ash enters the powder conveying pipeline 6 from the air outlet of the mixing chamber together with the hot air, and is transported to the separator 8 through the powder conveying pipeline 6.

[0043] As a preferred embodiment, Figure 1 As shown, the feeding mechanism includes a powder conveying bin 5 for storing fly ash, a discharger 3 and a valve 4. A discharge pipe is provided at the bottom of the powder conveying bin 5. The valve 4 is installed on the discharge pipe to control the on-off of the discharge pipe. The top end of the discharger 3 is connected to the discharge pipe, and the bottom end thereof is connected to the powder inlet of the mixing chamber.

[0044] When unloading, first open valve 4, the fly ash in the powder conveying bin 5 enters the discharge pipe, and then is unloaded through the unloader 3 to prevent blockage, and then the fly ash falls into the mixing chamber under the action of gravity.

[0045] As a preferred embodiment, Figure 1 As shown, the air supply mechanism 1 includes a fan 103, a filter 102 and a muffler 101, wherein two mufflers 101 are provided, namely a first muffler and a second muffler, and two filters 102 are provided, namely a first filter and a second filter. Figure 1 From the perspective of the present invention, the first muffler and the first filter are located on the left side of the fan 103, and the second muffler and the second filter are located on the right side of the fan 103. Furthermore, the right end of the first muffler is connected to the air inlet of the first filter through a pipe, the air outlet of the first filter is connected to the air inlet of the fan 103, the air inlet of the second filter is connected to the air outlet of the fan 103 through a pipe, the air outlet of the second filter is connected to the left end of the second muffler, and the right end of the second muffler is connected to the air inlet of the mixing chamber through the air supply line 2.

[0046] Turn on the fan 103, and the outside air enters from the left end inlet of the first muffler, and then passes through the first filter, the fan 103, the second filter and the second muffler in sequence before entering the air supply pipe 2, and finally enters the mixing chamber through the air supply pipe 2.

[0047] It should be noted that the muffler 101 is used to reduce the noise generated by the fan 103 when it is working, and the filter 102 is an air filter, which can filter out 98% to 99% of the dirt in the air, thereby protecting the working parts inside the fan 103 and the coal mill 9.

[0048] As a preferred embodiment, Figure 1 and Figure 2 As shown, an interface 7 is provided on the side wall of the separator 8, a door body 602 is installed on the interface 7, and the powder conveying pipeline 6 includes a powder conveying pipe and a reducer 601, wherein one end of the reducer 601 is connected to the door body 602 on the interface 7, and the other end is connected to one end of the powder conveying pipe, and the other end of the powder conveying pipe is connected to the air outlet of the mixing chamber.

[0049] It should be noted that a coal powder separation baffle 801 is provided in the separator 8 , and the interface 7 is located below the coal powder separation baffle 801 .

[0050] Optional, such as Figure 2As shown, the reducer 601 is a conical tube, and the diameter of the reducer 601 increases from one end of the reducer 601 away from the interface 7 to the other end, and the end of the reducer 601 close to the interface 7 is higher than the other end. By tilting the reducer 601, the fly ash sprayed through the reducer 601 can be parabolic, which is convenient for the fly ash to be fully dispersed, and also convenient for the fly ash to be fully mixed with the coal powder in the separator 8.

[0051] As an alternative embodiment, since the wind force at one interface 7 is limited, when the amount of fly ash is large, it is difficult for all the fly ash to be blown up by the hot air, and it is also difficult to fully mix with the coal ash. Figure 3 As shown, the separator 8 is provided with two interfaces 7, which are symmetrically arranged about the axis of the separator 8, and the two interfaces 7 are connected through an elbow 603, and a feed hole is provided on the elbow 603, and one end of the powder conveying pipeline 6 is connected to the feed hole. In this way, the fly ash in the powder conveying pipeline 6 is divided into two strands through the elbow 603, and the two strands of fly ash enter the separator 8 from the two interfaces 7 on the separator 8. Compared with entering the separator 8 from one interface 7, the advantage of this embodiment is that the fly ash in the powder conveying pipeline 6 is divided into two strands, and the fly ash can be completely blown up by hot air, which is also more conducive to the full mixing of fly ash and coal powder.

[0052] As an optional embodiment, Figure 1 As shown, a circular hole is provided on the side wall of the air supply pipeline 2, and a pressure tube 201 is sealed on the circular hole. The other end of the pressure tube 201 is sealed, and a stop valve 202 and a pressure measuring device 203 are installed on the pressure tube 201. Specifically, the pressure measuring device 203 is a pressure transmitter. The wind pressure is monitored by the pressure measuring device 203, so that the controller can control the wind force of the fan 103.

[0053] Optional, such as Figure 1 As shown, a check valve 104 is installed on the air supply pipeline 2, and the check valve 104 is used to prevent the hot air from flowing back.

[0054] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fly ash decarbonization system, characterized in that: The invention comprises a coal mill (9), a coal-fired boiler and a coal powder supply and conveying assembly, wherein the coal mill (9) comprises a separator (8), a discharge port (902) is provided at the top of the separator (8), and a feed port of the coal-fired boiler and a discharge port (902) of the coal mill (9) are connected via a conveying pipeline; The separator (8) has an air duct inside for screening coal powder, and the air duct is connected to the discharge port (902); The separator (8) is provided with at least one interface (7), and the interface (7) is connected to the air duct; One end of the powder replenishing conveying component is connected to the interface (7), and the powder replenishing conveying component is used to blow fly ash into the air duct.

2. A fly ash decarbonization system according to claim 1, characterized in that: The powder replenishing and conveying assembly comprises a material replenishing mechanism, a material conveying mechanism, a mixing chamber, an air supply mechanism (1) and a powder conveying pipeline (6); The mixing chamber has a mixing cavity inside, a powder inlet is provided on the top of the mixing chamber, an air inlet and an air outlet are provided on the mixing chamber, and the powder inlet, the air inlet and the air outlet are all connected to the mixing cavity; The feeding mechanism is connected to the powder inlet and is used to feed fly ash into the mixing chamber; One end of the air supply mechanism (1) is connected to the air inlet and is used to supply air into the mixing chamber; One end of the powder conveying pipeline (6) is connected to the air outlet, and the other end thereof is connected to the interface (7).

3. A fly ash decarbonization system according to claim 2, characterized in that: The feeding mechanism comprises a powder conveying bin (5) for storing fly ash and a discharger (3), the discharge port of the powder conveying bin (5) is provided with a discharge pipe, the discharge pipe is provided with a valve (4) for controlling the on-off thereof, one end of the discharger (3) is connected to the discharge pipe, and the other end thereof is connected to the powder inlet of the mixing chamber.

4. A fly ash decarbonization system according to claim 2, characterized in that: The air supply mechanism (1) comprises a fan (103) and a filter (102); an air inlet of the fan (103) and an air outlet of the filter (102) are connected via a pipeline; and an air outlet of the fan (103) is connected to an air inlet of the mixing chamber.

5. A fly ash decarbonization system according to claim 4, characterized in that: The air supply mechanism (1) further comprises a muffler (101), wherein two mufflers (101) are provided, namely a first muffler and a second muffler, and two filters (102) are provided, namely a first filter and a second filter; The air inlet of the first muffler and the first filter are connected via a pipeline, and the air outlet of the first filter is connected to the air inlet of the fan (103); The air inlet of the second filter and the air outlet of the fan (103) are connected via a pipe, the air outlet of the second filter and the first end of the second muffler are connected, and the second end of the second muffler and the air inlet of the mixing chamber are connected via an air supply pipeline (2).

6. A fly ash decarbonization system according to claim 5, characterized in that: The air supply pipeline (2) is connected to an air pressure pipe (201), and a stop valve (202) and a pressure measuring device (203) are installed on the air pressure pipe (201).

7. A fly ash decarbonization system according to claim 2, characterized in that: The powder conveying pipeline (6) comprises a powder conveying pipe and a reducer (601), wherein a first end of the reducer (601) is connected to the interface (7), and a second end is connected to one end of the powder conveying pipe, and one end of the powder conveying pipe is connected to an air outlet of the mixing chamber, and the diameter of the reducer (601) decreases from the first end to the second end of the reducer (601).

8. A fly ash decarbonization system according to claim 2, characterized in that: The separator (8) is provided with two interfaces (7), the two interfaces (7) are symmetrically arranged about the axis of the separator (8), the two interfaces (7) are connected via a bend pipe (603), a feed hole is provided on the bend pipe (603), and one end of the powder conveying pipeline (6) is connected to the feed hole.

9. A fly ash decarbonization system according to claim 7, characterized in that: One end of the reducer (601) close to the interface (7) is higher than the other end.

10. A fly ash decarbonization system according to any one of claims 1 to 9, characterized in that: The air duct comprises an inner air duct and an outer air duct which are connected to each other. The discharge port (902) of the separator (8) is connected to the inner air duct, and the interface (7) is connected to the outer air duct.

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